Display screen portion with icon for an atrial orientation marker



FIG. 1 is a front view of the display screen portion with icon for an atrial orientation marker showing a first embodiment of my new design; and,

FIG. 2 is a second embodiment thereof.

The dot-dash broken line perimeter illustrates a display screen portion and forms no part of the claimed design. 

CLAIM The ornamental design for a display screen portion with icon for an atrial orientation marker, as shown and described. 